Radiocoil



May 1, 1928.

D. A. NICOSIA ET AL.

RADIocoIL Filed Nov. 19, 1923 5 Sheets-Shel?h l May l, V1928.

D. A. NICQSIA ET AL RADIOCOIL Filed Nov. 2.9. 192s 3 Sheets-Sheet 2 Patented May 1, 1928. v l l UNI-TED STATES PATENT orifice.

DAVID A. NICOSIA, OF FOREST PARK, AND HARRY SIPPEL, CHICAGO, ILLNOIS.

RADVIOCOIL.

Application filed November 19, 1923. Serial No. 675,562.

This invention relates to a variable inithev use of a double contacting member in pedance means and particularly to a device use with the form of coil illustrated in Fig- Wliich is adapted to be used in an electric ure s. circuit comprising a part of apparatus used Figure 7 is a fragmentary perspective so e in radio telegraphy or telephony. view of the right-hand end ot' the coil shown lnA adjusting such a circuit to proper opin Figure et. eiating'k relations for varying conditions ot' Figure '8 is a fragmentary perspective transmission and reception, it is necessary view. illustrating a n'iodiiication embodying to vary the impedance ot the circuit by a variable condenser.

, oa 1o changing both the capacity and inductanco Figure 9 is a perspective View illustrating ory either thereot. Such conditions inalre it a variometer type coil. desirable that readily adjustable apparatus Figure l is a perspective view showing be provided and practical considerations rethe iight-hand end of the coil illustrated quiie that such apparatus be compact, acin Figure To i curate durable and caiable or ecf'inoinical Figures ll and l2 are Ucrsciective views s i n i l manufacture. illustrating an induction coil having a niodi It is an object therefore ot this invcnned arrangement of contacting members. tion to provide an apparatus or. tno class .fis shown on the drawings:

described which is compact and wherein the lhe reference numeral i indicates a suit- 7 2o desiredresults are attaiiiedwith u inininuun able base toi-ined or wood, vulcanite or au number ol soldered connections. other suitable material` which is preferably Itis a further object ot-this invention to non-conducting. Secured to the buse l and provid@ a de wie@ of: the class described extending upwardly from either end thereof wherein a separate connection may be made are uprightsQ which are constructed ot suitso with each turn ot' the inductance coil Withable insulatingfnriaterial,V such as wood, and outthe necessity of separate connections which act to support an insulating cylinder thereto for such purpose. 3 of cardboard, libre or other suitable ma- It is also an important obJect of this interialin adesired position on the base l. vention to provide a device ot the. class de- The cylinder as supported on the uprights e5 3o scribed wherein proper insulation may be. 2 is substantially parallelfto the base l and, provided at a minimum expense and wherein as shown in the drawings, the ends thereof a variable connection may be made directly are open. with each turn of an induetance coil. A coil ort' electrical,conductor coii'iprising Other und further iii'iportant objects ot usual insulated metallic wire is wound ou Elfi this invention will be apllnirrent trom the the cylinder o and it ywill be noted iroin an disclosures in the specification und the acexamination of the drawings this coil is conipauying drawings. so wound on` the cylinder that thc turns The invention in. .a pi'ctci'i'cd torni is thereof extend longitudinall \v und parallel show-nonthc drawings and hereinafter more to the XS Of d10 Cj'lllill, 110 @Ulla 0f d10 o5 40 fully described. turns being-formed o ver the edges ot the cyl- On the drawings: inder at the ends thereof.

Figure l is a perspective. view oi a coilV Circuits inv which the coils are connected embodyingthe principles of the present inmay have leads' which extend to usual ter* vention. i minal binding posts mounted on the base m() a5 Figure 2 is a fragmentary perspective plate l.

viewshowing the right-hand end of the coil rhis invention provides means for variaillustratedin Figure l. bly connecting` the turns ot" the coils which Figure 3y is a` perspective view showing a are wound on the cylinders 3 with an external slightly-modi-ed Ytorni ol coil embodying the circuit and due to the provision ot the iin- 5o principles of this invent-ion. -ioved form ot coils. and contacting or Figure 4 is a perspective view shoe-ing switching means eii'ibodied in the present inanother modification. ventiOn, it is possible to effect the adjust- Figure 5 is a fragmentary perspective' ments of these variable coni'iccthms with a view illustrating a portion o" the form otl high degree oli accuracy.

of coilshown in Figure s. .in each of the constructions shown7 a Figure 6 is a perspective view illustrating shaft 6 is journalled in thel uprights 2 and frictionally engages the conductors e at the 10 and 11 in Figure 5.

Vthrough the medium of a ends of the cylinder. insulated from each other by the usual coating of insulatingmaterial and at the ends of the cylinder this material is preferably removed so that an electric circuit may be completed between each turn of the coil and the contact members 7 -when the same are in engagement therewith. Said contact meme bersI 7 are preferably of such form as to enbu't one conductor at any given time, and consequently, a very accurate adjust- Vment of the coil relative to the circuit may be effected. Connected to the free end of each of said contact members 7 is a flexible conductor 8 Which extends from the contact member to one of the binding or terminal posts .5.

Y.ln the constructions of Figures et to 7 inclusive is shown a plurality of coils superposed on the cylinder 3, the turns of each coil extending longitudinally of the cylinder and parallelro the axis thereof. These coils are preferably separated. by layers of suitable insulating material such as shown at 9, rEhe terminals of these coils are connected with the binding post either directly or through contact as the conditions of the particular circuit may require. In this construction7 adjustment of the outer coil relative to th-e circuit may be effected by means of a contact member 12 which is similar in constructionto the contact members 7 and Which is mounted on an insulated sleeve 13 rotatable on the shaft C and operable, if desired,

suitable dial secured thereto (not shown). lt will, of

course, by uinflerstood that in the construcdescribed` the outermost coil does coil, and because tion not entirely cover the inner n of this construction, it is possible to make contact With the ends of a portion of each coil. Y Y

In this construction, the contact member 7 which contacts the ends of the turns of the Aconductora is insulated from the shaft 6,

being` mounted on an insulating tube 16 r0- tatable on said shaft and adjustable independently thereof.

ln the constructions illustrated in Figures 9 and'10, a semi-cylinder 17 concentric with the cylinder 3 is mounted inside thereof on Y,

the shaft 6 and spaced therefrom. lVound on said semi-'cylinder 17 is a coil 18, the turns u of which extend parallel to the conductors 'L1 on the cylinder 3.

Terminal conductors 19 of the coils 4 and f 18` lead to the usual binding posts 5 on the Said conductors 4 are.

base 1 and since the semi-cylinder 17 is rotatable inside the cylinder by rotation of the shaft (3, a further variation of the inductance of the circuit may be obtained through such relative rotation. Further adjustment is provided for by means of a contact member 20 which is similar to the contact member 7 and which is mounted on an insulating sleeve 20, rotatably mounted on the shaft 6.y Said contact member 20 is adapted to contact the ends of the turns of the coil formed'by the conductor 4 in the manner previously described.' Y

-in Figures 11 and 12, We have illustrated a construction wherein a plurality of contact members similar tothe contact member 7 may be separately moved into adjusting position relative to the ends of the turns formed by the conductor e to effect an exV ceedingly accurate adjustment of the concentrated inductance interposed in the circuit by said coil. In addition to the contact member 7 Which is mounted on the shaft 6 at one end thereof, the coil is provided with additional contact members 22 and 23 which are separably rotatable on the shaft G and which are insulated from said shaft and from each other by insulating sleeves 2i and Q5, respectively. lt will, of course, be understood that each of said sleeves may be provided with an adj listing dial and that lany ivell-known form of dials may be used.

It will be apparent from the foregoing description that this invention provides an improved concentrated impedance which may be conveniently used in an electric circuit' and which may be varied to effect an exceedingly accurate adjustment. It will also be noted that with the construction providedV it is possible to make separate contacts with each turn of the coil and when this apparatus is used as a coupler in a radio circuit, the accurate adjustments which may be attained by a sliding type coupled are closely approximated.

It will also be apparent that the forni of apparatus shown inFigures 9 and 1() may be used as a variometer Which is capable of very accurate adjustment.

ln the form of apparatus shown in Figure 8, a concentrated impedance comprising inductance and capacity is provided in such a v form that a minimum space is required and of such construction that the necessary adjustments may be conveniently made. The apparatus of this invention may be economically manufactured, is durable and, as previously pointed out, occupies a minimum of space. i Y Y Y le are aware that numerous details of construction may be varied throughY a widerange Without departing Vfrom the principles of this invention, and We therefore vdo not purpose limiting the patent granted, other- Wise than necessitated bythe prior art.

We Claim as our invention:

In a device of the class described, concentric spaced relatively rotatable hollow cylindrical members, a base, and a pair of sup- 5 porting' members secured to said base and extending' upward therefrom at either end of said cylindrical members for supporting the same, a shaft, said shaft being` supported by and extending through said supportingr 10 members, a conductor coiled on each of said members With the turns of each coil extending longitudinally on the inner and outer peripheries of the member on Which it is Wound, uninsulated portions at the ends of certain ot said turns, and movable contacting` means for Contacting` said uninsulated portions.

In Witness whereof, We have hereunto subscribed our names.

DAVID A. NICOSIA. HARRY SIPPEL. 

